Cheapo Cardio

Hello, for financial reasons I am giving up my gym and would like to do cheap drop in cardio classes like old school aerobics or zumba. I notice alot of yoga and pilates as well as expensive personal trainer sessions. Does anyone know of cardio in the area?

Not sure what your budget is, but the Colombo Centre near Waterloo is the cheapest gym I have used in SE1. I pay 20 quid a month for the use of the well-equipped gym but I know they do group classes as well.